What is the best approach for preparing a scalp lotion consisting of 3 g saponine coaltar, 0.5 g prednisolone, and water up to 100 g, considering that prednisolone is insoluble in water and the 3 g of alcohol-based saponine coaltar is likely insufficient to keep the prednisolone in solution upon dilution, and how does saponine coaltar behave when diluted with water?

What is the correct storage temperature for magistral preparations containing nystatin, given that Farmassitente (no. 138, p. 5) states they should be stored outside the refrigerator, while the Therapeutic Magistral Formulary (TMF) indicates they must be refrigerated?

Regarding the transdermal absorption of gabapentin 10% cream in a buffered cetomacrogol base, when preparing a 10% gabapentin vaginal cream using this specific base, will the medication also be absorbed transdermally?

Since various versions of capsicum oleoresin contain different amounts of capsaicinoids, should this be taken into account when preparing dermatological products?

What is the recommended shelf life and preparation method for a prescription consisting of 4g erythromycin and 4.8 million units of nystatin in unbuffered cetomacrogol cream, specifically regarding whether citric acid must be added as with previous erythromycin formulations, given the conflicting storage advice of one week versus four weeks in the refrigerator?

What is the most common concentration of vitamin A used in mouthwashes, and is there any benefit to adding it to a mouthwash solution?

Where can the content of polymyxine B sulfate be found?